20875555 has 8 divisors (see below), whose sum is σ = 25858944. Its totient is φ = 16161600.

The previous prime is 20875553. The next prime is 20875577. The reversal of 20875555 is 55557802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20875555 - 2¹ = 20875553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20875553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67186 + ... + 67495.

It is an arithmetic number, because the mean of its divisors is an integer number (3232368).

Almost surely, 2^20875555 is an apocalyptic number.

20875555 is a deficient number, since it is larger than the sum of its proper divisors (4983389).

20875555 is a wasteful number, since it uses less digits than its factorization.

20875555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134717.

The product of its (nonzero) digits is 70000, while the sum is 37.

The square root of 20875555 is about 4568.9774567183. The cubic root of 20875555 is about 275.3463624714.

The spelling of 20875555 in words is "twenty million, eight hundred seventy-five thousand, five hundred fifty-five".